Sleeve element and appurtenant bolt element

ABSTRACT

A universally utilizable mounting anchor, particularly for cementing into a concrete element, is provided. A bolt element having a locking wing formed on one end is insertable in a sleeve element, the said locking wing being adapted to be engaged in a locking groove in the sleeve, the locking groove being formed on the rear side of an intermediate bottom in the sleeve, said bottom being provided with an opening for through passage of the locking wing when the bolt is inserted into the sleeve.

United States Patent Waerner 1 Feb. 1,1972

[54] SLEEVE ELEMENT AND APPURTENANT BOLT ELEMENT [72] Inventor: Thor Waemer, Graf. Reckstr. 160, Dusseldorf, Germany [22] Filed: Dec. 12, 1969 [21] Appl. No.2 884,608

[52] U.S.Cl. ..52/704, 85/1 H [51] int. Cl ..E04b H41 [58] Field of Search ..52/125, 127, 704, 705, 706, 52/707, 701, 709; 85/1 H [56] References Cited UNITED STATES PATENTS 882,050 3/1908 Clough ..85/1 l-l 3,418,781 12/1968 Penote ...52/704 X 7/1916 Von Wolffradt. 3/1918 Collings 1,732,699 10/ l 929 Selah ..52/ 709 2,950,576 8/1960 Rubenstein ..52/704 X FOREIGN PATENTS OR APPLlCATlONS 147,644 1/1921 Great Britain ..52/709 399,581 10/1933 Great Britain ..52/709 Primary Examiner-Price C. Faw, Jr. AttorneyYoung & Thompson [5 7 ABSTRACT A universally utilizable mounting anchor, particularly for cementing into a concrete element, is provided. A bolt element having a locking wing formed on one end is insertable in a sleeve element, the said locking wing being adapted to be engaged in a locking groove in the sleeve, the locking groove being formed on the rear side of an intermediate bottom in the sleeve, said bottom being provided with an opening for through passage of the locking wing when the bolt is inserted into the sleeve.

1 Claims, 5 Drawing Figures PATENTEB FEB 1 i972 3.638.386

SHEET 1 0f 3 IN VENTOR. 7/10,? WAEe/ve'e PATENTEB rm 1 1972 3638.386

' sum 2 or 3 IN VENTOR. 7/ /02 W/QE/VE a FATENTED FEB 1 m2 SHKEY 3 BF 3 sleeve-bolt connection in general.

' The particular aim of the invention is to provide a so-called mounting anchor such as'is used in mounting of precast concreteielements in the building industry, where the sleeve element constitutes the anchor shoe, and the bolt constitutes the anchor head. The advantages and practical embodiment of the invention are described-hereinafter in connection with such mounting anchors. The invention is not restricted to such embodiments and utilization, however, since it applies to a When using precast concrete elements, there is great need 'jfora rapid and safe method of connecting the precast concrete elements to the hoisting equipment and transport equipment, and the need is just as great for means of securing the precast concrete elements to one another during assembly. At the present time this need is met by cementing into the ele- .ments securing members, for example in the form of screwbolts projecting from the elements or in the form of eye bolts and the like. The use of screw connections is time-consuming, however, and the threaded portions are easily damaged. Eye bolts, or projecting reinforcing rods which are bent to fonn eyes, are advantageous when used to provide a connection for hoisting equipment, but such securing means or anchoring members are not suitable for other purposes such as the securing of two precast concrete elements together and temporary mounting of concrete elements prior to cementing.

The objectof thepresent invention is thus particularly to provide a universally utilizable mounting anchor, particularly for concrete elements, the mounting anchors being relatively inexpensive to produce and, above all, simple to work with and of the greatest possible security with regard to quality of connection. 7

in accordance with the invention, a sleeve element is pro- .vided for receiving a bolt element insertable in the sleeve and being formed, at the insertion end thereof, as a locking wing which, when rotated, is brought into engagement with a locking groove in the sleeve, and the sleeve element according formed on the rear side of an intermediate bottom in the sleeve, said intermediate bottom being provided with an opening for .through passage of the locking wing when the bolt is inserted into the sleeve. The bolt element is locked into place in that it is inserted into the sleeve and the locking wing is then passed through the opening in the intermediate bottom, whereafter the bolt element is rotated about its longitudinal axis until the locking wing achieves engagement with the locking groove on the rear side of the intermediate bottom. The special embodiment of the intermediate bottom allows an advantageous sleeve element embodiment which is eminently suitable for cementing into a concrete element.

In accordance with the invention the intermediate bottom is suitably effected as a disc mounted in the sleeve rotatably about the axis of the sleeve. When the bolt element of such an embodiment is locked into place in the sleeve element, the bolt element may be rotated about its longitudinal axis since the disc, as hereinbefore; stated, is rotatably mounted in the sleeve. An advantage of this feature being that the position of the bolt element may be adjusted to the particular need, since for example, a welded eye on the projecting end of the bolt element may be adjusted to the correct angle.

In accordance with the invention, the sleeve element is preferably formed having an enlarged portion for rotatable reception of the disc. This embodiment is particularly advantageous in that the disc, which represents a power-transferring element, is supported by, for example, the surrounding concrete when the sleeve element is cemented into a concrete element.

-tothe invention is characterized in that the locking groove is In order further to secure the anchoring of the sleeve element it may be provided with a reinforcing helical element which is connected to the sleeve. The said reinforcing helical element is cemented into the concrete element together with the sleeve with the result that extremely good anchorage, and great security against breaking out, is achieved.

An important feature of the invention is that a resilient force be provided which retains the locking wing of the bolt element in engagement with the locking groove in the intermediate bottom. ln accordance with the invention, therefore, a spring element may be arranged in the sleeve between the intermediate bottom and the bottom of the sleeve. The said spring element will be compressed when the locking wing is inserted and will contribute to maintaining the locking wing in engagement with the locking groove.

The invention also relates to a bolt element, particularly for use in connection with a sleeve element as previously described, and is provided with a locking wing, on the insertion end thereof, for engagement with the locking groove in the sleeve, and the bolt element in accordance with the invention is characterized in that a spring element is arranged on the bolt, the said spring element being supported at one spring end against the bolt and with the other spring end adapted to be in bearing relationship with a portion of the sleeve, for

resilient urging of the locking wing into engagement with the locking groove. This effects retention of the bolt element in locked position, i.e., in the position where the locking wing is in engagement with the locking groove in the intermediate bottom. When the bolt is provided with such a spring, the spring described previously hereinbefore between the intermediate bottom and the bottom of the sleeve, is not required. The arrangement of the spring on the bolt element is advantageous in that, the sleeve element is less expensive, and this factor is of great significance inasmuch as the sleeve element can be used once only, since it is retained in the concrete element, while the bolt element may be used repeatedly.

in accordance with the invention, the spring element is suitably effected as a helical spring disposed around the bolt and is supported against the bolt with the spring end which faces from the locking wing. On the bolt, between the spring and the locking wing, an annular disc may suitably be arranged. For protection of the spring it may be disposed in an annular chamber in the bolt element.

The spring element may also extend from the locking wing in the longitudinal direction of the bolt.

When the bolt element is in place in the sleeve element, the connection may be released in that the bolt element is pressed in, so that the locking wing is disengaged from the locking groove, whereafter the bolt element is rotated until the locking wing is aligned with the slot in the intermediate bottom. To prevent the bolt element from being pressed in it may, in accordance-with the invention and at the portion projecting from the sleeve element, be formed for reception of a securing element which prevents further insertion of the bolt element into the sleeve element after the locking wing is in locked position in the locking groove.

The invention ofiers many advantages when used in connection with ready-mixed concrete elements.

The sleeve element is cemented into the concrete element and is produced preferably from an inexpensive plastic material. The sleeve element represents, when so used, an anchor shoe which is retained in the concrete element. It is thus of great importance with such anchor shoes that the cost is reduced as much as possible, and this is achieved by means of the sleeve element according to the invention, since, as already mentioned, it may be produced from a cheap plastic material, and only the intermediate bottom, which is preferably in the form of the rotatably mounted disc, need be of steel. in this connection, the cost of the bolt element or anchor head is of little or no importance since these elements may be used repeatedly.

A further advantage of using a plastic sleeve is that ugly rust marks on the concrete surface are avoided, the part of the sleeve element facing outwardly toward the surface of the concrete being made of plastic. The actual supporting steel member is arranged within the sleeve. If so desired, the inserted disc or intermediate bottom may be of stainless steel.

In that the point of power action is located a certain distance within the sleeve element, greater stress of concrete is possible. This is due to the known phenomenon that a threedimensional stress occurs on power action within a concrete body.

As previously stated, the mounting anchor, i.e., the sleeve element or anchor shoe, may be suitably provided with a reinforcing helical element. Such a reinforcing helical contributes to the prevention of breakout of the concrete on oblique stress. It is advantageous to provide the sleeve element with the reinforcing helical element prior to casting, so as to prevent displacement of the reinforcing helical with respect to the sleeve element when casting. The sleeve elements leave only small holes in the concrete surface, and the holes may either be cemented, or covered with closure elements if it is desirable to retain the sleeve elements for subsequent attachment of, e.g., repair scaffolding.

The bolt element, which constitutes one-half portion of the mounting anchor, may be formed at the projecting end thereof into various shapes as required. For hoisting purposes the bolt element may be formed at its outer end as an eye. Used as securing member for oblique support, the bolt element may be provided at its extremity with a flattened portion having key way for wedging the oblique support. The extremity of the bolt element may also be provided with threads for securing eventual outer wall covering or, e.g., for screwing on of an adjustment socket for adjusting concrete elements.

The invention is described further in the following with reference to the drawings which illustrate preferred embodiments and utilization possibilities.

FIG. 1 shows a longitudinal section through a sleeve element according to the invention. FIG. 2 shows a section along the line lI-II in FIG. 1. FIG. 3 shows a longitudinal section through a ready-mounted mounting anchor, with a sleeve element of the type shown in FIG. 1. FIG. 4 shows a section through a ready mounted mounting anchor, with a sleeve element as in FIG. 1, but with another embodiment of the bolt element. FIG. 5 shows a bolt element in partial section.

The sleeve in FIG. 1 is made from a plastic material and has a bottom 2. The sleeve 1 has an enlarged portion 3, and, within the said enlarged portion is inserted a steel disc 4 rotatably mounted about the axis of the sleeve. The steel disc has a through-going, elongate opening 5, and a locking groove 6 is cut on the underside or rear side of said disc 4. Around the sleeve 1 is mounted a reinforcing helical element 7 which is attached to the sleeve at 8. A spring element (not shown) is loosely arranged in the bottom of the sleeve.

In FIG. 3 a similar sleeve element as in FIG. 1 is shown cemented into a concrete element 9. A bolt element 10 is shown inserted into the sleeve element and in locked position. At its insertion end, the bolt element is provided with two locking wings 11 and 12 which are in engagement with the locking groove 6 in the disc 4. Within the locking Wings 11 and 12, an annular disc 13 is arranged on the bolt, said annular disc being compressed by a spring 14 in direction toward the locking wings. The spring 14 is supported at its other end against a spacer 15 which with its outer portion, bears against a collar 16 on the bolt. The annular disc 13, in FIG. 3, bears against the disc 4 and retains the locking Wings l1, 12 in engagement with the locking groove 6.

At its outer end, the bolt element 10 has a flattened portion 17 with a groove 18 for a wedge 19. In the embodiment example shown, an oblique support is attached to the concrete element 9 in that the plate 21, which is connected with the oblique support 20, is mounted onto the bolt element 10 and secured in place by means of the wedge 19.

When the oblique support 20 is to be released, the wedge 19 is first removed and the oblique support is removed with the plate 21. It is then possible to press the bolt element 10 in against the action of the spring 14 until the locking wings 11 and 12 are out of engagement with the locking groove 6, whereafter the bolt element is rotated until the locking wings are in alignment with the elongated opening 5 in the disc 4. When the bolt element is in this position the spring 14 will tend to urge the bolt element out of the sleeve 1, whereby the removal of the bolt element is facilitated.

When the operation is finished, the opening in the concrete element 9 may be cemented or covered with a suitable plug, e.g., of plastic or other suitable material.

In the embodiment example in FIG. 4, a further bolt embodiment is used. The bolt 22, at its insertion end, is provided with two locking wings 26 and 27, which are shown in engagement with the locking groove on the rotatable steel disc 4. At its outer end the bolt has an eye 23, and a bore 24 for insertion of a securing pin which prevents the bolt from being pushed in and thus prevents the engagement between locking wings and locking groove from being inadvertently released. In contrast to the bolt 10 in FIG. 3, the bolt 22 is provided with a spring 25 which is mounted on the insertion end thereof and is in bearing relationship with the bottom of the sleeve.

A similar bolt but without the spring 25 may be used in connection with the sleeve as disclosed in FIG. 1. The spring element 38 will then urge the bolt into locking engagement with the locking groove.

The mounting anchor in FIG. 4 may be demounted by removing the securing pin (not shown). The bolt element is then pressed in until the locking wings are out of engagement with the locking groove, whereafter the bolt element may be rotated until the locking wings are in alignment with the through opening in the disc. The spring 25 constantly tends to urge the bolt element some distance out of the sleeve and thus facilitates the removal of the bolt element.

The advantage of the rotatable steel disc 4 will be obvious. After the bolt element has been mounted, the spring 14 and 25 respectively will retain the bolt element in locking engagement and it is possible to rotate the bolt element to a selected degree, which is of great significance, for example, when using oblique supports 20, since it is then possible to rotate the slot 18 to correct position, as the eye 23 in FIG. 4, for example, may be rotated to the desired position.

In FIG. 5 a further embodiment of the bolt element is shown. The bolt element 28 has, at its outer end, a threaded portion 29 for screwing on of an adjustment socket or a nut member, and, in this portion, is also provided with a through bore 36 for a securing pin which has the same function as the securing pin described in connection with FIG. 4. On the insertion end the bolt element is formed with a locking pin which is provided at its outer end with two locking wings 31 and 32. On the locking pin in this embodiment, an annular disc 33 is also provided which, by means of a spring 34, is pressed in direction toward the locking wings. TI-Ie spring is received in an annular chamber 35 in the bolt element 28.

The sleeve element and bolt element according to the invention are described hereinbefore in connection with the socalled mounting anchors for concrete elements. As previously stated, the invention is not, of course, restricted to such utilization, and nor is the invention restricted to the constructive embodiments of the sleeve element and bolt element as illustrated.

Having described my invention, I claim:

I. A socket to receive a stud which is provided at one end with projecting wings, said socket comprising an elongated housing and a stud-engaging member, the housing having intermediate its length a radially enlarged portion in which said stud-engaging member is located, said radially enlarged portion having front and rear walls that are engageable with the front and rear faces of said member and that prevent said member from moving to either end of said housing, said member having an elongated opening through which stud wings pass on insertion of a stud into the socket and a recess formed in the rear face of said member with which said wings may be engaged by rotating the stud after passing it through said member, and a stud in the socket housing, the stud shank carrying a coiled spring element encircling the stud shank and bearing resiliently against said engaging member, said shank having at one end projecting wings, the wings passing through the opening in the engaging member and, when the stud is rotated about a longitudinal axis of the housing, engaging the 5 recess formed in the rear face of the member, said element urging said wings into said recess. 

1. A socket to receive a stud which is provided at one end with projecting wings, said socket comprising an elongated housing and a stud-engaging member, the housing having intermediate its length a radially enlarged portion in which said stud-engaging member is located, said radially enlarged portion having front and rear walls that are engageable with the front and rear faces of said member and that prevent said member from moving to either end of said housing, said member having an elongated opening through which stud wings pass on insertion of a stud into the socket and a recess formed in the rear face of said member with which said wings may be engaged by rotating the stud after passing it through said member, and a stud in the socket housing, the stud shank carrying a coiled spring element encircling the stud shank and bearing resiliently against said engaging member, said shank having at one end projecting wings, the wings passing through the opening in the engaging member and, when the stud is rotated about a longitudinal axis of the housing, engaging the recess formed in the rear face of the member, said element urging said wings into said recess. 